The new method in the determination of negative ion surface-active agent is introduced, comparing with methylene blue method, it have merits of simple operation step and little dosage.

介绍了水中阴离子表面活性剂测定新方法，该法与亚甲蓝法比较，具有操作步骤简单，萃取剂用量少的优点。

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The main contents of the paper include: establishment of WUA, management organization and operation of WUA, water price business accounting and determination of WUA, property and water right of WUA.

论文主要研究内容包括：用水者协会的组建、用水者协会的管理机构与运行、用水者协会的水价核算与确定、用水者协会的资产与水权。

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Presents the selection and calculation method and quantity determination of the circulating water pumps, and the operation characteristics of the pumps in parallel.

介绍了循环水泵的选择计算方法，循环水泵台数的确定原则，以及水泵并联运行的特点。

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